2 in 1 Digital Protractor - Measure not only length, but also 360 angle (interior angle, exterior angle). Locking Function Use locking screws to lock both legs in the desired position or angle. Large 1" LCD Screen - LCD with electronic digital display, you can switch between degrees and minutes with the "/" button. The HOLD button stores the data during measurement, the ON/OFF/Zero button resets the data to zero by short pressing any angle. Angle lock button for each angle. Measuring angle: 000.0 ~ 999.9 Accuracy 0.3 Resolution: 0.1 Measuring range: 0-360 . The ruler body is forged from high quality stainless steel, which ensures quality, corrosion resistance and durability. Excellent quality - The scale forged from steel High-quality stainless steel is laser-engraved (scale in mm and inches), resistant to abrasion and corrosion.